# 口袋化学 vs 四维世界：空间探索

The clearest difference is in-app purchases: 四维世界：空间探索 at none against 口袋化学's 1. 四维世界：空间探索 also leads on update cadence (every 5 days vs every 2 weeks). 口袋化学's advantage is iOS requirement (13.0 vs 16.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 口袋化学 sells 1 one-off in-app purchase. 四维世界：空间探索 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for 口袋化学 against 5.0 for 四维世界：空间探索. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

口袋化学 ships an update every 2 weeks, 四维世界：空间探索 every 5 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | 口袋化学 | 四维世界：空间探索 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/and/id6504169379/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/id6787638663/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 60 MB | 4 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [宇 刘](https://appshunter.io/developer/1551581698) | [越 王](https://appshunter.io/developer/6787476168) |

## What reviewers say

### 口袋化学

[App page](https://appshunter.io/ios/app/and/id6504169379)

This app is a comprehensive chemistry learning and reference tool. It offers a detailed periodic table, a vast database of inorganic and organic substances, and a searchable collection of over 1300 chemical reaction equations. It also includes resources for common gas preparation, metal activity, solubility, formulas, and molar mass calculation.

**Highlights:** Detailed periodic table with element details, Database of over 400 inorganic and organic substances, Searchable library of 1300+ chemical reaction equations, Categorized reaction types, Common gas preparation methods, Metal activity series, Solubility tables, Molar mass calculator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 永久会员 | $2.99 | one-time |


### 四维世界：空间探索

[App page](https://appshunter.io/ios/app/id6787638663)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 口袋化学 free?

口袋化学 is free to download, with in-app purchases available.

### Is 四维世界：空间探索 free?

四维世界：空间探索 is free to download, with no in-app purchases.

### Which has better reviews, 口袋化学 or 四维世界：空间探索?

口袋化学 and 四维世界：空间探索 are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do 口袋化学 or 四维世界：空间探索 have ads?

Neither 口袋化学 nor 四维世界：空间探索 shows ads.

### Which is updated more often, 口袋化学 or 四维世界：空间探索?

口袋化学 ships an update every 2 weeks, and 四维世界：空间探索 every 5 days. Most recently, 口袋化学 was updated on October 25, 2026 and 四维世界：空间探索 on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*